Forces Flashcards
what happens when you apply force to an object?
change in size and shape of body
how can a force change the motion of a body
a force can cause an object to move or speed up , to slow down , to stop, or to change direction
what does it mean if there is no resultant force on a body
it remains at rest or continues at constant speed
what is friction
force between two surfaces which impedes motion and results in
heating.
formula for force in hooke’s law
force = k (spring constant) x X (extension)
what is a form of friction
air resistance
what is hooke’s law
the displacement or size of the deformation is directly proportional to the force applied.
what is limit of proportionality
the point beyond which Hooke’s law is no longer true when stretching a material
significance of the ‘limit of proportionality’ for an extension–load graph
the object does not return to its original length when the force is removed
formula for force
f=mass x acceleration
describe qualitatively motion in a circular path due to a perpendicular force
As the centripetal force acts upon an object moving in a circle at constant speed, the force always acts inward as the velocity of the object is directed tangent to the circle
what is moment of a force
the measure of its turning effect. for example turning a door handle, sitting on a seesaw or closing a pair of scissors
relationship between force or distance to pivot to moment of a force
increasing force or distance from the pivot increases the moment of a force
formula for moment
moment = force x distance to the pivot
what is the pivot
the central point
